package com.cd.cms.common.utils;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;


public class HttpRequest {
//	private static final Logger logger = LoggerFactory.getLogger(HttpRequest.class);
	
	/**
	 * 向指定URL发送GET方法的请求
	 * 
	 * @param url
	 *            发送请求的URL
	 * @param param
	 *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
	 * @return URL 所代表远程资源的响应结果
	 * @throws Exception 
	 */
	public static String get(String url, String param) throws Exception {
		StringBuilder result = new StringBuilder();
		BufferedReader reader = null;
		InputStreamReader inreader = null;
		try {
			if (StringUtils.isNotEmpty(param)) {
				url = url + "?" + param;
			}
			URL realUrl = new URL(url);
			// 打开和URL之间的连接
			URLConnection connection = realUrl.openConnection();
			// 设置通用的请求属性
			connection.setConnectTimeout(30000);
			connection.setReadTimeout(30000);
			connection.setRequestProperty("accept", "*/*");
			connection.setRequestProperty("connection", "Keep-Alive");
//			connection.setRequestProperty("user-agent",	"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
			connection.setUseCaches(false);
			// 建立实际的连接
			connection.connect();
			// 获取所有响应头字段
			Map<String, List<String>> map = connection.getHeaderFields();
			// 遍历所有的响应头字段
//			for (String key : map.keySet()) {
//				System.out.println(key + "--->" + map.get(key));
//			}
			String charsetName  = "utf-8";
			if (map.get("Content-Type") != null) {
				String value = map.get("Content-Type").toString();
				if (value.contains("charset=GBK")) {
					charsetName = "gbk";
				}
			}
			// 定义 BufferedReader输入流来读取URL的响应
			inreader = new InputStreamReader(connection.getInputStream(), charsetName);
			reader = new BufferedReader(inreader);
			
			String line;
			while ((line = reader.readLine()) != null) {
				result.append(line);
			}
		} catch (Exception e) {
			System.out.println("发送GET请求出现异常！" + e.getMessage());
			throw e;
		}
		// 使用finally块来关闭输入流
		finally {
			try {
				if (reader != null) {
					reader.close();
				}
				if (inreader != null) {
					inreader.close();
				}
			} catch (Exception ex) {
				ex.printStackTrace();
			}
		}
		return result.toString();
	}

	/**
	 * 向指定 URL 发送POST方法的请求
	 * 
	 * @param url
	 *            发送请求的 URL
	 * @param param
	 *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
	 * @return 所代表远程资源的响应结果
	 * @throws Exception 
	 */
	public static String post(String url, String param) throws Exception {
		PrintWriter out = null;
		BufferedReader in = null;
		String result = "";
		try {
			URL realUrl = new URL(url);
			// 打开和URL之间的连接
			HttpURLConnection conn = (HttpURLConnection)realUrl.openConnection();
			// 设置通用的请求属性
			conn.setConnectTimeout(60000);
			conn.setReadTimeout(60000);
			conn.setRequestProperty("accept", "*/*");
			conn.setRequestProperty("connection", "Keep-Alive");
//			conn.setRequestProperty("Accept-Encoding", "gzip");
//			conn.setRequestProperty("user-agent",
//					"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
			// 发送POST请求必须设置如下两行
			conn.setRequestMethod("POST");
			conn.setDoOutput(true);
			conn.setDoInput(true);
			// 获取URLConnection对象对应的输出流
			out = new PrintWriter(new OutputStreamWriter(conn.getOutputStream(), "utf-8"));
			// 发送请求参数
			out.print(param);
			// flush输出流的缓冲
			out.flush();
			// 定义BufferedReader输入流来读取URL的响应
			conn.connect();
			in = new BufferedReader(
					new InputStreamReader(conn.getInputStream(), "utf-8"));
			String line;
			while ((line = in.readLine()) != null) {
				result += line;
			}
		} catch (Exception e) {
			System.out.println("发送 POST 请求出现异常！" + e.getMessage());
			throw e;
		}
		// 使用finally块来关闭输出流、输入流
		finally {
			try {
				if (out != null) {
					out.close();
				}
				if (in != null) {
					in.close();
				}
			} catch (IOException ex) {
				ex.printStackTrace();
			}
		}
		return result;
	}
}
